'Great integrity'

"Off the clock hours are all too common for the American worker. This practice harms workers, denies them the wages they have rightfully earned and takes away time with families," said Susana Blanco, of the US Labor Department.

However, the regulator added that LinkedIn had cooperated with the investigation and had agreed to take proactive steps to prevent future violations.

"This company has shown a great deal of integrity by fully cooperating with investigators and stepping up to the plate without hesitation to help make workers whole," said David Weil, administrator of the Wage and Hour Division.

"We are particularly pleased that LinkedIn also has committed to take positive and practical steps towards securing future compliance."